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From Jan Høydahl (JIRA) <>
Subject [jira] [Commented] (SOLR-2356) indexing using DataImportHandler does not use entire CPU capacities
Date Thu, 25 Apr 2013 21:08:18 GMT


Jan Høydahl commented on SOLR-2356:

In my opinion, DIH should be completely redesigned as a standalone webapp. It is a major design
flaw that it is a RequestHandler within a Solr Core/collection.

As a standalone web app it could easily be deplyed on its own, talk to multiple collections
and be parallellized.
> indexing using DataImportHandler does not use entire CPU capacities
> -------------------------------------------------------------------
>                 Key: SOLR-2356
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: update
>    Affects Versions: 4.0-ALPHA
>         Environment: intel xeon processor (4 cores), Debian Linux Lenny, OpenJDK 64bits
server v1.6.0
>            Reporter: colby
>            Priority: Minor
>              Labels: test
>   Original Estimate: 168h
>  Remaining Estimate: 168h
> When I use a DataImportHandler to index a large number of documents (~35M), cpu usage
doesn't go over than 100% cpu (i.e. just one core).
> When I configure 4 threads for the <entity> tag, the cpu usage is splitted to 25%
per core but never use 400% of cpu (i.e 100% of the 4 cores)
> I use solr embedded with jetty server.
> Is there a way to tune this feature in order to use all cores and improve indexing performances
> Because for the moment, an extra script (PHP) gives better indexing performances than
> thanks

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